AFSK on the K3/K3S is fine with low tones if the radio AFSK TX filter is
enabled. Set MMTTY taps to 512 too. Make sure to set the same audio tone pair
in both the radio and MMTTY.
73,
Ed W0YK
On Apr 24, 2017 2:44 PM, Jim N7US <jim@n7us.net> wrote:
>
> I'm replacing my K3 with a K3S and plan to use AFSK (using the internal
> soundcard) after using only FSK for many years.
>
> I prefer listening to low tones, 1225/1445. I understand that high tones
> are recommended for AFSK to prevent the possibility of transmitting the
> second harmonic.
>
> My questions are K3/K3S specific:
>
> 1) Are low tones OK?
>
> 2) Can/should the AFSK TX 400-Hz DSP transmit audio filter, which is
> selected in the K3's configuration? A friend just got his K3S and turning
> on the filter apparently prevented the AFSK transmission, which leads me to
> conclude the filter is designed for high tones.
>
> I use DXLab with WinWarbler as my general logger, which can use only MMTTY
> to transmit RTTY. I understand that it's good to set MMTTY taps to 512 to
> transmit a narrow signal, so I'll do that. I'll also consider transmitting
> AFSK with 2Tone when using N1MM+.
>
> Any other suggestions?
>
> Thanks very much.
>
> 73, Jim N7US
>
>
>
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